NT91214 查看數據表（PDF） - Unspecified

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NT91214

Tone/Pulse Dialer

Unspecified 

3. Manual dialing with automatic access pause

a. Off Hook O P D1 . . . Dn

pause key entries can be accepted and stored in the

redial memory. Each is stored as a digit.

Each key-in will provide a pause of 3.57 seconds,

depending on which model is being used.

4. Redial

a. On Hook RD or On Hook HFI ↓ RD

Up to 32 digits (in PULSE mode) or 31 digits

(in TONE mode) can be dialed using the RD key.

The RD key is disabled while PULSE or TONE

signals are being transmitted. Redial will also be

inhibited if the last number dialed exceeds 32 digits

because the redial memory can only hold 32 digits.

b. Off Hook RD D1 . . . Dn or On Hook

HFI ↓ RD D1 . . . Dn

After pressing the RD key, digits may be added to

the number in redial memory. When finished

dialing,

the redial memory will contain the original digits,

plus the digits dialed after pressing RD . Each time

the redial key is pressed, the stored number will be

dialed exactly the same as it was previously,

regardless of the status of the MODE IN pin.

5. TONE/PULSE switching operation

a. On Hook D1 . . . Dn MODE IN pin

PULSE Mode

switched to VSS Dn+1 . . . Dn+m

DTMF Mode

NT91214/15 Series

The mode selection pin is alwsys checked for TONE

or PULSE mode key entry. Dialing can be switched

from PULSE to TONE mode, but not from TONE to

PULSE mode. Switching the MODE IN pin to the

original digits plus the digits dialed after pressing will

cause the chip to store a */T digit prior to the first

tone digit in the redial memory and will automatically

insert a 2.2 second pause before the tone digits are

dialed out. After the mode bas been switched, the

status of the mode selection pin will no longer be

checked. Therefore, it will not be possible to switch

from TONE to PULSE mode.

b. Off Hook D1 . . . Dn */T Dn+1

PULSE Mode

. . . Dn+m

DTMF Mode

PULSE mode is initially defined with the mode

selection pin, MODE IN, equal to VDD or floating. At

this time, the mode can be switched to DTMF by

pressing the */T key. DTMF mode will being as soon

as the last pulse has been transmitted. In this mode,

Dn+1 through Dn+m are sent through the TONE

OUT pin as DTMF signals. If a P key entry is

Contained in the series of digits before or after the */T

entry, or the MODE IN switch is depressed, 2.2

second

pause will be added to the automatically inserted

pause time, which is also 3.57 seconds. Both of the

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V1.0

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